Honeywell Portable Plus Wireless Door Chime and Push Button... Portable around your home or yard for ultimate convenience; Easy installation - no wires and no need to program the included bell push button; Flashing light indication when chime push is activated (optional - can be turned off if desired) - ideal for homes with napping children, those who are hard of hearing or have home offices; 150 ft. range (46 meters); 4 chime tunes with CD quality sound (Ding Dong, Fantasia, Westminster, & Smart Saxophone); 3 adjustable volume levels; Works with up to 4 bell push buttons for additional doors throughout the home; Bell push button is individually coded to avoid interference with other users; LED feedback on the bell push to let guests know a signal has been sent.